单级型储能逆变器并离网控制和切换研究

摘要

介绍了单级型储能逆变器的拓扑结构和基本原理,并分别设计了逆变器在并网与离网模式的控制策略,以及在此基础上以减少两种模式切换过程中的电压和电流冲击为目标,研究了两种模式的平滑切换方法.设计方案保证了逆变器并网时的稳定运行,离网时重要负载的正常工作,以及并网/离网平滑切换功能,最后通过在一台50 kW储能逆变器上实验验证了设计的合理性和实用性.%The topology and basic theory of single-stage inverter are introduced.The control strategy in grid-connected and off-grid modes are designed.Based on this,it studies on the smooth switch method in order to reduce the current and voltage impacts when switching.The method ensures the stable operation of inverter in grid-connected mode,normal working of important load when off-grid and the switching of grid-connected and off-grid.Finally,experimental results are provided to testify the rationality and practicability of the control strategy on a 50 kW power storage inverter.